: When the toilet upstairs is flushed, the toilet on the main floor gurgles and blurps and basically almost flushes itself. What causes this? My house is over 50 years old and still has cast iron pipes in the basement. Could this be part of the problem? We have a septic tank and well water. Any ideas/suggestions?

Reply:It appears by your description that you have a restricted drain line that needs to be snaked & cleaned by a licensed plumber. The age of of the piping in most cases is not a factor.Good Luck. e-plumber